Improvement in wrenches for inserting bung-bushes



' D. A Wrench for I GKERMAN. nserting Bang-Bush.

Patented Mar. n, 1879.v

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v Jn/en or:

UNITED S'rAfrEsPA'rnN'r Grrr-ong,

DAVID ACKERMAN, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN WRNCHES FOR INSERTING BUNG-BUSHES.4

Speciiication forming part of Letters Patent No. 213,026, dated March 11,1879 application tiled November '7, 1878.

To all whom 'it may concern:

Be it known that I, DAvD ACKERMAN, of the city of Chicago, Cook county, State of Illinois, have invented new and useful Improvements in Vrenches for Inserting Bung- Bushes, of which the following is a full description, reference being had to the accompanying drawings, in which- Figure lis an elevation ,showing the wrench ready for operation; Fig. 2, a cross-section on line a: a" of Fig. l; Fig. 3, an elevation of the stem and head, a portion of the head being in section, showing also the retaining-cap and one of the plates in section, the remainder of tlie plates being removed; Fig. 4, a cross-section on line y y of Fig. 3.

This invention relates to wrenches for inserting hollow screw-plugs or metal facin gs for openings, and is primarily designed for the insertion of bung-bushes. Its object is to con-- struct a wrench which, when in use, will bear uniformly in all directions against the face of the bush or facing, so as to prevent the breaking of the bush from uneven strain, and insure a` more even insertion thereof in position; and its nature consists in providing a head with a stem having a conical portion provided with a screw-thread, in providing a series of plates or leaves arranged around the stem, so as to be capable of expansion throughthe medium of the screw-thread, andin securing such plates in position by a cap at their lower ends and a groove or recess in thehead at theirupper ends.

In the drawings,A represents the head; B, the stem or support; G, the expanding plates or staves; D, the retaining-cap; E, the opening for the insertion of a rod or lever; F, the rod or lever; a, the groove Vor recess in the head; b, the upper ends of the plates; c, the space or opening to receive the lower ends of the plates; d, the lower ends of the plates; e, the corrugations or teeth on the exterior face of the plates; f, the screw-threaded end of the stem; g, the securing-nut.

The headAmay be castor otherwise formed, and is provided with an opening, E, to receive a rod or lever, F, by means of which the wrench is operated, as shown.l The stem or support B is formed with the head A, and has a conical portion, which is provided with a screw-thread, as shown in Fig. 2. The plates C are cast or otherwise formed so as to have an interior face which will tit the conical portion of the stem, which face is provided with a corresponding screw-thread to that on the stem and exterior face, having a slight taper, which, as shown, is provided with corrugations or teeth e, to prevent slipping when engaged with the inner face of the bush. These plates C are located around the stem or shank B, so that they will be expanded or contracted by the action of the screw-thread when the head is revolved. The upper ends, b, of these plates C enter a groove or recess, a, formed in the under face of the head A, around the base of the stem, and their lower ends, d, enter an opening, c, between the flange of the cap D and the portion of the stem below the cone, so that the plates are heldin position around the stem, and are free to be raised or lowered by the action of the screw-thread. The plate of the cap D is provided with a central opening to receive the lower end of the stem, over which it is slipped, and, as shown, is provided with an upward-proj ecting iian ge, to prevent the lower ends, cl,of theplates or staves from bein gsprun g out in operation. The lower end, f, as shown, is provided with a screw-thread to receive a nut, g, by means of which the cap D is held in position. The groove or recess a, should be of a sufticient depth to allow the ends b to slide up therein when the plates are expanded.

In Fig. 1 the parts are shown in the position they occupy when the wrench is to be inserted in the bush, the plates being atI their lowest point, in which position they will extend entirely around the stem, or nearly so, and will allow the wrench to be easily inserted in the bush and till the opening therein, so that when expanded the leaves will be carried or pressed outward uniformly in all directions, thereby keeping the bush round, and preventing any uneven strain on the bush, which would be liable to break it.

In use, after the wrench is inserted in the bush, a slight turn in the direction required for inserting the bush will carry the stem B down, raising the plates C, which enlarges their diameter, and causes the wrench to engage rmly with the bush on all sides of its opening, which engagement will continue until the bush is inserted, when a slight reverse movement can be given to the head, causing` the plates to contract, and allowing ofthe easy withdrawal of the wrench from the bush. The stem might be made conical its entire length, a corresponding shape being given to "the inner faces of the plates, and instead of four plates, C, as shown, two or more might be used; but in either case the stem is to be provided with a screw-thread for raising and lowering the plates, so as to increase or dimnish their diameter.

What I claim as new, and desire to secure by Letters Patent, is

l. The head A, provided with a conical screw-threaded stem, B, and adapted to receive and operate two or more expanding plates, substantially as and for the purposes specied.

2. The head A, provided with the conical screw-threaded stem B, in combination with the plates C and retaining-cap D, whereby the revolving ofthe head will expand or contract the plates, substantially as specilied.

3. The head A, provided with the conical screw-threaded stem B, in combination with the plates or leaves C, cap D, and nut g, substantially as and for the purposes specified.

DAVID AGKERMAN. YVitnesses O. W. BOND, H. F. BRUNs. 

